Bastards Ascension: A Playground of Gods - Chapter 33: Demigods play

A scientific genius named Thomas Harrier was transmigrated to an imperial prince body after a car accident that took his life. He found out that he is in a world similar to our own with a timeline akin to early twentieth century. The body that he is occupying was the imperial prince of a failing empire who suddenly rose to power after a successful assassination attempt of his father. Unaware that the attack is just the beginning of what is to come. He faces many challenges throughout. Will Thomas Harrier be able to live his second life in peace while running an empire and getting it back to its former glory? Or will he succumb into a conspiracy lurking within the country's borders?

Expect some:

Cold war era techs.

Super battleship with advanced electronics, propulsion, and fire control systems?
Helicopters?
Missiles?
Modern medicines and equipment?
AC-130?
A nuke?
Challenger or Abrams or Leopard?
F-4 Phantom or MIG-21?
Colored TV's.

Everything!!!

PS. Cover not mine, I just found it on google.

The journey to the martial peak is a lonely, solitary and long one. In the face of adversity, you must survive and remain unyielding. Only then can you break through and continue on your journey to become the strongest. High Heaven Pavilion tests its disciples in the harshest ways to prepare them for this journey. One day the lowly sweeper Kai Yang managed to obtain a black book, setting him on the road to the peak of the martials world.

- Description from novelupdates

An Nuan thought that she was going to have her happy ending, marrying the love of her life when the man left her on their wedding day.“Pei Zhi Yi, the moment you step into the elevator, it's over between us.”An Nuan thought that she could stop her fiance from leaving, but that man still left for the other woman.The wedding hall was prepared and the guests had all arrived. With no groom beside her, An Nuan decided that she would marry anyone willing.“An Nuan, if you are willing, then how about considering me as your groom?”Unexpectedly, the young master of the Lin family, Lin Xiao Feng stepped forward to offer himself.An Nuan did not expect much from this marriage, especially when they both agreed that they were seeking to gain something through this marriage.Lin Xiao Feng needed someone as his wife in his political career. Meanwhile, she just needed to marry someone to get over Pei Zhi Yi. As someone who was disappointed by love, An Nuan no longer wanted to believe in love.She never thought that the marriage that she did not expect would turn out better than she had expected. Young Master Lin would pamper her and support her whenever she needed help.Wasn’t their marriage just for show?

The entire world knows that the heir of the Jiang family is smitten with Miss Lu, but Miss Lu doesn't see it that way.Lu Jing thinks Jiang Ye has too many unbearable traits and doesn't want to indulge him.One day,the heir runs to the Lu residence.“Lu Jing, when will you finally grant me a formal status?”“Lu Jing, don't accept their things, whatever you want I will give you!”“Lu Jing, you are mine, and you can only ever belong to me in this lifetime!”Lu Jing: “Scram~ Stop disturbing my sleep!”(1v1, reunion after separation, pursuing wife to the crematorium.)